Phosphor, light source and LED
View Patent ↗A phosphor with high efficiency having an excitation band corresponding to light of the ultraviolet-visible (300 to 550 nm) wavelength region emitted from a light emitting portion which emits blue or ultraviolet light is provided. A nitride of Ca, a nitride of Al, a nitride Si, and an oxide of Eu are prepared, and respective raw materials are weighed so that a mol ratio of respective elements becomes Ca:Al:Si:Eu=0.985:3:1:0.015, mixed under a nitrogen atmosphere, and thereafter fired at 1500° C. in a nitrogen atmosphere to thereby produce a phosphor having a composition formula Ca 0.985 SiAlN 3 :Eu 0.015 .
1. A phosphor represented by a general formula M—A—B—N:Z,
wherein the element M is a divalent element, the element A is a trivalent element, the element B is a tetravalent element, the N is nitrogen, and the element Z is an activator in the phosphor, and
wherein the phosphor is represented by a composition formula MmAaBbNn:Zz, the phosphor having a composition ratio being (m+z):a:b:n=1:1:1:3.
2. The phosphor according to claim 1 ,
wherein the element M is at least one or more elements selected from the group consisting of beryllium, magnesium, calcium, strontium, barium, zinc, cadmium, and mercury,
wherein the element A is at least one or more elements selected from the group consisting of boron, aluminum, gallium, indium, thallium, yttrium, scandium, phosphorus, arsenic, antimony, and bismuth,
wherein the element B is at least one or more elements selected from the group consisting of carbon, silicon, germanium, tin, titanium, hafnium, molybdenum, tungsten, chromium, lead, and zirconium, and
wherein the element Z is at least one or more elements selected from rare-earth elements or transition metal elements.
3. The phosphor according to claim 1 , wherein the element A is aluminum and the element B is silicon.
4. The phosphor according to claim 1 wherein a host material structure of the phosphor substantially does not include oxygen.
5. The phosphor according to claim 1 , wherein a value of a mol ratio:z/(m+z) of the element M and the activator element Z is in a range from 0.000 1 to 0.5.
6. The phosphor according to claim 1 , wherein the element M is at least one or more elements selected from the group consisting of magnesium, calcium, strontium, barium, and zinc.
7. The phosphor according to claim 1 , wherein the element Z is at least one or more elements selected from the group consisting of europium, manganese, and cerium.
8. The phosphor according to claim 7 , wherein the element Z is europium.
9. The phosphor according to claim 8 , wherein the element M is calcium, the element A is aluminum, and the element B is silicon.
10. The phosphor according to claim 1 , wherein the phosphor is in a powder form.
11. The phosphor according to claim 10 , wherein an average particle size of the phosphor is 20 μm or smaller and 1 μm or larger.
12. A light source, comprising:
a phosphor according to claim 1 ; and
a light emitting portion emitting light having a wavelength of 300 nm to 550 nm.
wherein a part of the light having a wavelength of 300 nm to 550 nm is used as an excitation source to make the phosphor emit light having a wavelength which is different form the wavelength of 300 nm to 550 nm.
13. A light emitting diode, comprising:
a phosphor according to claim 1 ; and
a light emitting portion emitting light having a wavelength of light from 300 nm to 550 nm.
wherein a part of the light having a wavelength of light from 300 nm to 550 nm is used as an excitation source to make said phosphor emit light having a wavelength which is different from the wavelength of 300 nm to 550 nm.
14. A light emitting diode comprising,
the phosphor according to claim 10 ; and
a light emitting portion emitting light having a wavelength of 300 nm to 550 nm,
wherein a part of said light having a wavelength of 300 nm to 550 nm is used as an excitation source to make said phosphor emit light having a wavelength which is different from the wavelength of 300 nm to 550 nm.
15. A light source comprising,
the phosphor according to claim 10 ; and
a light emitting portion emitting light having a wavelength of 300 nm to 550 nm,
wherein a part of said light having a wavelength of 300 nm to 550 nm is used as an excitation source to make said phosphor emit light having a wavelength which is different from the wavelength of 300 nm to 550 nm.